austal releases new footage of combat ship, page-7

From the website below:
The USS Independence is one of two rival designs for a revolutionary new class of high-speed, affordable warships with multi-mission capabilities. The other LCS design, the USS Freedom from Lockheed Martin, was commissioned on November 8, 2008. Both ships make use of aluminum, which helps ensure high-speed operations, a shallow draft, and increased maneuverability in potentially dangerous coastal environments in which they will operate. The USS Freedom has an all-aluminum superstructure and steel hull, and the Navy is planning to deploy her two years earlier than planned.

More... http://www.pr-inside.com/alcoa-defense-hails-the-commissioning-of-r1671436.htm

Looks like both competing designs have an aluminium superstructure. I take this to mean all except the hull.